Aguero took his league-best tally to 25 goals with his third
hat-trick of the campaign as second-placed City thrashed QPR 6-0 on
Sunday.

The 26-year-old Argentina international has scored 31 goals in
all competitions this term, while he has netted a total of 106 in
almost four full seasons with City, having arrived in a big-money
transfer from Atletico Madrid in 2011-12.

But Aguero can take his game to another level, according to
Pellegrini.

"When I see Kun playing the way he played today I'm happy how he
is improving. It is not the same Aguero that played one year ago,"
he said.

"He understands he must work harder, he receives a lot more
ball. He is working harder during the week. In the way he continues
improving, he will continue improving in the future.

"He is just 26. He must be a very important player in the future
of this club. He was already but I think he must continue improving
in the way he plays."